Living By Chemistry SECOND EDITION Unit 2 SMELLS
Living By Chemistry SECOND EDITION Unit 2: SMELLS Molecular Structure and Properties
Lesson 33: Where’s the Fun? Functional Groups
Chem. Catalyst Consider the following compounds. List at least three differences and three similarities between the two molecules. Molecule 1 Molecule 2
Key Question What does the structure of a molecule have to do with smell?
You will be able to: • identify and name basic functional groups within molecules • relate certain functional groups to certain smell categories • describe the naming patterns found among molecules associated with specific functional groups • deduce the probable smell of a compound from its name or structural formula
Prepare for the Activity Work in pairs.
Discussion Notes A number of patterns emerge from the card sort. Each group of molecules with a similar smell has something identical in its structure.
Discussion Notes (cont. ) This feature is found in all the sweet-smelling molecules in our sample.
Discussion Notes (cont. ) This feature is found in all the minty-smelling molecules in our sample.
Discussion Notes (cont. ) Functional group: A cluster of atoms in a molecule that is responsible for many of its properties. The functional groups have names, and molecules frequently are named according to the functional groups they contain.
Discussion Notes (cont. )
Discussion Notes (cont. )
Discussion Notes (cont. )
Discussion Notes (cont. )
Discussion Notes (cont. ) There are other functional groups.
Discussion Notes (cont. )
Wrap Up What does the structure of a molecule have to do with smell? • Functional groups are structural features that show up repeatedly in molecules and seem to account for some of their chemical properties. • Molecules containing the same functional groups have similar smells. • The chemical names of molecules are often related to the functional groups they contain. Thus, chemical name is related to smell.
Check-In If a molecule is sweet-smelling, what other things do you know about it? List at least three things that are probably true.
- Slides: 18